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Cliff Lamb - Estrus Synchronization Protocols for Cows

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Estrus Synchronization Protocols for Cows, Cliff Lamb, University of Florida, NCBA Convention, January 28, 2010, session on Applied Reproductive Strategies in Beef Cattle

Estrus Synchronization Protocols for Cows, Cliff Lamb, University of Florida, NCBA Convention, January 28, 2010, session on Applied Reproductive Strategies in Beef Cattle

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  • 1. Estrus Synchronization Protocols for Cows Cliff Lamb University of Florida Applied Reproductive Strategies in Beef Cattle NCBA Convention January 28, 2010 US Beef Semen Sales and Custom Estrous Synchronization Protocols Collected Semen Hybrid Synch Two shot PGF MGA/PGF 4 x 106 units 7-11 Synch Select Synch MGA Select Hybrid Synch+CIDR Ov-synch Presynch Resynch One shot PGF CIDR/PGF CO-synch CO-synch+CIDR Heat Synch http://www.naab-css.org/sales/table_list.html
  • 2. Percentage of Semen Sold and Collected US Beef Cow Inventory Compared to Beef Cow Inventory 11% http://www.nass.usda.gov Definitions !Synchronization Rate: % of females detected in estrus compared to total number synchronized. !Conception Rate: % of females pregnant compared to number of females inseminated. !Pregnancy Rate: % of females pregnant compared to total number synchronized. 2 ! Prostaglandin (PGF2!) System Select Synch PGF PGF Heat detect GnRH PGF Heat detect and AI and AI -14 0 144 -7 0 144 Days from PGF Hours from PGF Days from PGF Hours from PGF
  • 3. Ovsynch CO-Synch GnRH PGF GnRH AI GnRH GnRH PGF & AI -7 0 48 -7 0 48 60-66 Days from PGF Hours from PGF Days from PGF Hours from PGF Select Synch & TAI 2!PGF2! vs. Select Synch PGF PGF Heat detect GnRH and AI GnRH PGF Heat detect & AI 2!PGF2! & AI -7 0 72-84 GnRH PGF Heat detect and AI Days from PGF Hours from PGF Select Synch (Stevenson et al., 2000) 2!PGF2! vs. Select Synch Select Synch vs. CO-Synch GnRH PGF Heat detect and AI Item 2!PGF2! Select Synch Select Synch No. of Cows 294 289 Synchronization rate, % 142/294 (48) 175/289 (61) GnRH Conception rates, % 86/142 (61) 115/175 (66) GnRH PGF & AI Pregnancy rates, % 86/294 (28) 115/289 (38) CO-Synch (Stevenson et al., 2000) (Grieger et al., 2001)
  • 4. Select Synch vs. CO-Synch CO-Synch vs. Ovsynch GnRH GnRH PGF & AI Item Select Synch CO-Synch CO-Synch No. of Cows 237 223 Synchronization rate, % 130/237 (55) - GnRH PGF GnRH AI Conception rates, % 93/130 (72) 106/223 (48) Ovsynch Pregnancy rates, % 93/237 (39) 106/223 (48) -7 0 48 72 Days relative to PGF Hours relative to PGF (Grieger et al., 2001) (Geary et al., 2001) CO-Synch vs. Ovsynch CO-synch vs. CO-synch+CIDR TAI & GnRH PGF GnRH CO-Synch TAI & GnRH PGF GnRH CIDR CO-Synch+CIDR -7 0 48 Days relative to PGF Hours relative to PGF (Lamb et al., 2001) (Geary et al., 2001) First Service Pregnancy Rates Effect of BCS on Pregnancy Rates Body condition score Treatments (Lamb et al., 2001) (Lamb et al., 2001)
  • 5. PGF TAI & GnRH Effect of Location on Pregnancy Rates CIDR CIDR-PG & TAI Detect estrus & AI TAI & GnRH PGF GnRH CO-Synch TAI & GnRH PGF GnRH CIDR CO-Synch+CIDR TAI & GnRH PGF GnRH Select Synch & TAI Detect estrus & AI TAI & GnRH PGF GnRH CIDR Select Synch+CIDR & TAI Detect estrus & AI -18 to -16 -7 0 60 84 Locations B B (Larson et al., 2006) Days relative to PGF Hours relative to PGF Pregnancy Rates after Estrus Detection Alone vs TAI 5-day CO-Synch + CIDR 58 53 54 53 TAI & GnRH PGF PGF GnRH 43 CIDR a b c a,b b -5 d 0 8±2h 72h Treatment P < 0.05 (Day et al., 2008) (Larson et al., 2006) 7-day CO-Synch + CIDR 5-day CO-Synch + CIDR TAI & GnRH PGF GnRH CIDR TAI & GnRH PGF PGF GnRH CIDR -7 d 0 60-66h -5 d 0 8±2h 72h
  • 6. Distribution of Estrus for 5-day and 7-day CO-Synch + CIDR protocols 7-day CO-Synch+CIDR TAI & GnRH PGF GnRH CIDR -7 d 0 60-66h 5-day CO-Synch+CIDR TAI & GnRH PGF PGF GnRH CIDR -5 d 0 8±2h 72h (Wilson et al., 2010) Pregnancy rate to 7-day Pregnancy rate to 5-day CO-Synch + CIDR protocol CO-Synch + CIDR protocol n > 7,000 n > 2,600 n > 2.100 n > 2,000 Calving Distribution of Cows Calving Effects of a fixed-time AI system on after TAI or Bull breeding calving distribution 44.1% vs. 24.7% Control Natural mating n = 285 TAI + GnRH GnRH PGF TAI CIDR Natural mating n = 263 (Rodgers, 2007) (Rodgers, 2007)
  • 7. Calving Distribution after Synchronization of Estrous Does the use of the CO-Synch + CIDR Protocol delay return to estrus? 438 suckled cows were estrous synchronized using the 7-day CO-Synch + CIDR Protocol. TAI & GnRH PGF GnRH CIDR (Larson et al., 2006) (Mercadante et al., 2010) Estrus response of cows following the Calving Distribution 7-day CO-Synch+CIDR protocol n=275 97.5% return to 90% Overall pregnancy rate estrus rate!! Average Interval to estrus = 20.9 days ?? n=85 n=37 n=34 (Mercadante et al., 2010) (Mercadante et al., 2010) Acknowledgements People Funding and Product Support Dr. Carl Dahlen ABS Global, Inc. Dr. Jamie Larson Blandin Foundation Intervet Animal Health Mr. Guilherme Marquezini IVX/Teva Animal Health Dr. Jeff Stevenson Merial Animal Health Graduate Students MN-AURI Technical staff NAAB Support staff Pfizer Animal Health Collaborators Select Sires, Inc. Co-authors U of FL Beef cattle producers U of MN USDA-CSREES
  • 8. Thank You! Contact Information: Cliff Lamb University of Florida 3925 HWY 71 Marianna, FL 32446 Tel: 850-394-9124 Email: gclamb@ufl.edu